How tall is 6'3? Is 6'3 tall?
Whether or not you find 6'3 to be tall is pretty subjective. Someone who is 6'3 might look short to you, or tall to you, depending on your own height.
If I am 6'3, am I tall or short?
It really depends on your age and the height of the population around you. In some countries 6'3 might be considered tall, but in other countries it could be considered short.